US3342760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable polymers
Assignee: Atlantic Richfield Co
•
Filing: 1961-10-26
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Granted: 1967-09-19
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Expires: 1981-10-26
Abstract
No abstract record available.
Inventors
- 👤 Daniel J Rode
- 👤 Greenawald Glenn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS FOR IMPREGNATING PREVIOUSLY FORMED POLYMERIC STYRENE PARTICLES WITH A NORMALLY LIQUID HYDROCARBON BLOWING AGENT COMPRISING: SUSPENDING, IN A CLOSED REACTOR, SAID PARTICLES IN A SOLUTION CONSISTING OF A SUSPENDING AID, WATER AND SAID BLOWING AGENT, HEATING SAID SOLUTION TO A TEMPERATURE OF ABOUT 90*C. TO BRING SAID SOLUTION TO THE CRITICAL PRESSURE OF SAID REACTOR AND MAINTAINING SAID CRITICAL PRESSURE FOR AT LEAST ABOUT TWO HOURS, BUT LESS THAN FOUR HOURS UNTIL SAID PARTICLES ARE IMPREGNATED SOLELY BY CONTINUALLY RAISING THE TEMPERATURE OF SAID SOLUTION TO ELEVATED TEMPERATURES BETWEEN 90 AND 120*C.
Claim 2
Dependent Claim
94 words
A PROCESS FOR IMPREGNATING PREVIOUSLY FORMED POLYMERIC STYRENE PARTICLES WITH A NORMALLY LIQUID HYDROCARBON BLOWING AGENT COMPRISING: SUSPENDING, IN A CLOSED REACTOR, SAID PARTICLES IN A SOLUTION CONSISTING OF A SUSPENDING AID, WATER AND SAID BLOWING AGENT, HEATING SAID SOLUTION TO A TEMPERATURE OF ABOUT 90*C. TO BRING SAID SOLUTION TO THE CRITICAL PRESSURE OF SAID REACTOR AND MAINTAINING SAID CRITICAL PRESSURE FOR AT LEAST ABOUT TWO HOURS, BUT LESS THAN FOUR HOURS UNTIL SAID PARTICLES ARE IMPREGNATED SOLELY BY CONTINUALLY RAISING THE TEMPERATURE OF SAID SOLUTION TO ELEVATED TEMPERATURES BETWEEN 90 AND 120*C.
References Cited (Backward Citations)
US2950261A
Cited
US2983692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |